This is a video showing the mechanics of the sway prop.
This is a wiper motor prop.
Are You Brave Enough - http://legacyofhorror.org/2017/02/are-you-brave-enough/
Night of the Living Dead - http://legacyofhorror.org/2017/02/night-of-the-living-dead/
Another Zombie Baby - http://legacyofhorror.org/2017/02/another-zombie-baby/
I Prefer These - http://legacyofhorror.org/2017/02/i-prefer-these/
Texas Style Jacket - http://legacyofhorror.org/2017/02/texas-style-jacket/
Human host - http://legacyofhorror.org/2017/02/human-host/